/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_pixels_c.h"
#include "SDL_rect_c.h"
#include "SDL_yuv_sw_c.h"


/* SDL surface based renderer implementation */

static SDL_Renderer *SW_CreateRenderer(SDL_Window * window, Uint32 flags);
static int SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_QueryTexturePixels(SDL_Renderer * renderer,
                                 SDL_Texture * texture, void **pixels,
                                 int *pitch);
static int SW_SetTexturePalette(SDL_Renderer * renderer,
                                SDL_Texture * texture,
                                const SDL_Color * colors, int firstcolor,
                                int ncolors);
static int SW_GetTexturePalette(SDL_Renderer * renderer,
                                SDL_Texture * texture, SDL_Color * colors,
                                int firstcolor, int ncolors);
static int SW_UpdateTexture(SDL_Renderer * renderer,
                            SDL_Texture * texture, const SDL_Rect * rect,
                            const void *pixels, int pitch);
static int SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                          const SDL_Rect * rect, int markDirty,
                          void **pixels, int *pitch);
static void SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void SW_DirtyTexture(SDL_Renderer * renderer,
                            SDL_Texture * texture, int numrects,
                            const SDL_Rect * rects);
static int SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect,
                         Uint32 color);
static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
                         const SDL_Rect * srcrect,
                         const SDL_Rect * dstrect, int blendMode,
                         int scaleMode);
static void SW_RenderPresent(SDL_Renderer * renderer);
static void SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void SW_DestroyRenderer(SDL_Renderer * renderer);


SDL_RenderDriver SW_RenderDriver = {
    SW_CreateRenderer,
    {
     "software",
     (SDL_Renderer_SingleBuffer | SDL_Renderer_PresentCopy |
      SDL_Renderer_PresentFlip2 | SDL_Renderer_PresentFlip3 |
      SDL_Renderer_PresentDiscard | SDL_Renderer_PresentVSync),
     (SDL_TextureBlendMode_None | SDL_TextureBlendMode_Mask |
      SDL_TextureBlendMode_Blend),
     (SDL_TextureScaleMode_None | SDL_TextureScaleMode_Fast),
     11,
     {
      SDL_PixelFormat_Index8,
      SDL_PixelFormat_RGB555,
      SDL_PixelFormat_RGB565,
      SDL_PixelFormat_RGB888,
      SDL_PixelFormat_BGR888,
      SDL_PixelFormat_ARGB8888,
      SDL_PixelFormat_RGBA8888,
      SDL_PixelFormat_ABGR8888,
      SDL_PixelFormat_BGRA8888,
      SDL_PixelFormat_YUY2,
      SDL_PixelFormat_UYVY},
     0,
     0}
};

typedef struct
{
    Uint32 format;
    int current_texture;
    SDL_Texture *texture[3];
    SDL_Surface surface;
    SDL_Renderer *renderer;
    SDL_DirtyRectList dirty;
} SW_RenderData;

static SDL_Texture *
CreateTexture(SDL_Renderer * renderer, Uint32 format, int w, int h)
{
    SDL_Texture *texture;

    texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
    if (!texture) {
        SDL_OutOfMemory();
        return NULL;
    }

    texture->format = format;
    texture->access = SDL_TextureAccess_Local;
    texture->w = w;
    texture->h = h;
    texture->renderer = renderer;

    if (renderer->CreateTexture(renderer, texture) < 0) {
        SDL_free(texture);
        return NULL;
    }
    return texture;
}

static void
DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    renderer->DestroyTexture(renderer, texture);
    SDL_free(texture);
}

static int
DisplayPaletteChanged(void *userdata, SDL_Palette * palette)
{
    SW_RenderData *data = (SW_RenderData *) userdata;
    int i;

    for (i = 0; i < SDL_arraysize(data->texture); ++i) {
        if (data->texture[i] && data->renderer->SetTexturePalette) {
            data->renderer->SetTexturePalette(data->renderer,
                                              data->texture[i],
                                              palette->colors, 0,
                                              palette->ncolors);
        }
    }
    return 0;
}

SDL_Renderer *
SW_CreateRenderer(SDL_Window * window, Uint32 flags)
{
    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
    SDL_DisplayMode *displayMode = &display->current_mode;
    SDL_Renderer *renderer;
    SW_RenderData *data;
    int i, n;
    int bpp;
    Uint32 Rmask, Gmask, Bmask, Amask;
    Uint32 renderer_flags;
    const char *desired_driver;

    if (!SDL_PixelFormatEnumToMasks
        (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
        SDL_SetError("Unknown display format");
        return NULL;
    }

    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
    if (!renderer) {
        SDL_OutOfMemory();
        return NULL;
    }

    data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
    if (!data) {
        SW_DestroyRenderer(renderer);
        SDL_OutOfMemory();
        return NULL;
    }

    renderer->CreateTexture = SW_CreateTexture;
    renderer->QueryTexturePixels = SW_QueryTexturePixels;
    renderer->SetTexturePalette = SW_SetTexturePalette;
    renderer->GetTexturePalette = SW_GetTexturePalette;
    renderer->UpdateTexture = SW_UpdateTexture;
    renderer->LockTexture = SW_LockTexture;
    renderer->UnlockTexture = SW_UnlockTexture;
    renderer->DirtyTexture = SW_DirtyTexture;
    renderer->RenderFill = SW_RenderFill;
    renderer->RenderCopy = SW_RenderCopy;
    renderer->RenderPresent = SW_RenderPresent;
    renderer->DestroyTexture = SW_DestroyTexture;
    renderer->DestroyRenderer = SW_DestroyRenderer;
    renderer->info = SW_RenderDriver.info;
    renderer->window = window->id;
    renderer->driverdata = data;

    renderer->info.flags = 0;

    if (flags & SDL_Renderer_PresentFlip2) {
        renderer->info.flags |= SDL_Renderer_PresentFlip2;
        n = 2;
    } else if (flags & SDL_Renderer_PresentFlip3) {
        renderer->info.flags |= SDL_Renderer_PresentFlip3;
        n = 3;
    } else {
        renderer->info.flags |= SDL_Renderer_PresentCopy;
        n = 1;
    }
    data->format = displayMode->format;

    /* Find a render driver that we can use to display data */
    renderer_flags = (SDL_Renderer_SingleBuffer |
                      SDL_Renderer_PresentDiscard);
    if (flags & SDL_Renderer_PresentVSync) {
        renderer_flags |= SDL_Renderer_PresentVSync;
    }
    desired_driver = SDL_getenv("SDL_VIDEO_RENDERER_SWDRIVER");
    for (i = 0; i < display->num_render_drivers; ++i) {
        SDL_RenderDriver *driver = &display->render_drivers[i];
        if (driver->info.name == SW_RenderDriver.info.name) {
            continue;
        }
        if (desired_driver
            && SDL_strcasecmp(desired_driver, driver->info.name) != 0) {
            continue;
        }
        data->renderer = driver->CreateRenderer(window, renderer_flags);
        if (data->renderer) {
            break;
        }
    }
    if (i == display->num_render_drivers) {
        SW_DestroyRenderer(renderer);
        SDL_SetError("Couldn't find display render driver");
        return NULL;
    }
    if (data->renderer->info.flags & SDL_Renderer_PresentVSync) {
        renderer->info.flags |= SDL_Renderer_PresentVSync;
    }

    /* Create the textures we'll use for display */
    for (i = 0; i < n; ++i) {
        data->texture[i] =
            CreateTexture(data->renderer, data->format, window->w, window->h);
        if (!data->texture[i]) {
            SW_DestroyRenderer(renderer);
            return NULL;
        }
    }
    data->current_texture = 0;

    /* Create a surface we'll use for rendering */
    data->surface.flags = SDL_PREALLOC;
    data->surface.format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
    if (!data->surface.format) {
        SW_DestroyRenderer(renderer);
        return NULL;
    }
    SDL_SetSurfacePalette(&data->surface, display->palette);

    /* Set up a palette watch on the display palette */
    if (display->palette) {
        SDL_AddPaletteWatch(display->palette, DisplayPaletteChanged, data);
    }

    return renderer;
}

static int
SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        texture->driverdata = SDL_SW_CreateYUVTexture(texture);
    } else {
        int bpp;
        Uint32 Rmask, Gmask, Bmask, Amask;

        if (!SDL_PixelFormatEnumToMasks
            (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
            SDL_SetError("Unknown texture format");
            return -1;
        }

        texture->driverdata =
            SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
                                 Bmask, Amask);
    }

    if (!texture->driverdata) {
        return -1;
    }
    return 0;
}

static int
SW_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
                      void **pixels, int *pitch)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        return SDL_SW_QueryYUVTexturePixels((SDL_SW_YUVTexture *) texture->
                                            driverdata, pixels, pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        *pixels = surface->pixels;
        *pitch = surface->pitch;
        return 0;
    }
}

static int
SW_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
                     const SDL_Color * colors, int firstcolor, int ncolors)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SetError("YUV textures don't have a palette");
        return -1;
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        return SDL_SetPaletteColors(surface->format->palette, colors,
                                    firstcolor, ncolors);
    }
}

static int
SW_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
                     SDL_Color * colors, int firstcolor, int ncolors)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SetError("YUV textures don't have a palette");
        return -1;
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        SDL_memcpy(colors, &surface->format->palette->colors[firstcolor],
                   ncolors * sizeof(*colors));
        return 0;
    }
}

static int
SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                 const SDL_Rect * rect, const void *pixels, int pitch)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        return SDL_SW_UpdateYUVTexture((SDL_SW_YUVTexture *) texture->
                                       driverdata, rect, pixels, pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
        Uint8 *src, *dst;
        int row;
        size_t length;

        src = (Uint8 *) pixels;
        dst =
            (Uint8 *) surface->pixels + rect->y * surface->pitch +
            rect->x * surface->format->BytesPerPixel;
        length = rect->w * surface->format->BytesPerPixel;
        for (row = 0; row < rect->h; ++row) {
            SDL_memcpy(dst, src, length);
            src += pitch;
            dst += surface->pitch;
        }
        return 0;
    }
}

static int
SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
               const SDL_Rect * rect, int markDirty, void **pixels,
               int *pitch)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        return SDL_SW_LockYUVTexture((SDL_SW_YUVTexture *) texture->
                                     driverdata, rect, markDirty, pixels,
                                     pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        *pixels =
            (void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
                      rect->x * surface->format->BytesPerPixel);
        *pitch = surface->pitch;
        return 0;
    }
}

static void
SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SW_UnlockYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
    }
}

static void
SW_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                int numrects, const SDL_Rect * rects)
{
}

static int
SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect, Uint32 color)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    Uint8 r, g, b, a;
    SDL_Rect real_rect;
    int status;

    if (data->renderer->info.flags & SDL_Renderer_PresentCopy) {
        SDL_AddDirtyRect(&data->dirty, rect);
    }

    a = (Uint8) ((color >> 24) & 0xFF);
    r = (Uint8) ((color >> 16) & 0xFF);
    g = (Uint8) ((color >> 8) & 0xFF);
    b = (Uint8) (color & 0xFF);
    color = SDL_MapRGBA(data->surface.format, r, g, b, a);

    if (data->renderer->
        LockTexture(data->renderer, data->texture[data->current_texture],
                    rect, 1, &data->surface.pixels,
                    &data->surface.pitch) < 0) {
        return -1;
    }
    data->surface.w = rect->w;
    data->surface.h = rect->h;
    data->surface.clip_rect.w = rect->w;
    data->surface.clip_rect.h = rect->h;
    real_rect = data->surface.clip_rect;

    status = SDL_FillRect(&data->surface, &real_rect, color);

    data->renderer->UnlockTexture(data->renderer,
                                  data->texture[data->current_texture]);
    return status;
}

static int
SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
              const SDL_Rect * srcrect, const SDL_Rect * dstrect,
              int blendMode, int scaleMode)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Window *window = SDL_GetWindowFromID(renderer->window);
    int status;

    if (data->renderer->info.flags & SDL_Renderer_PresentCopy) {
        SDL_AddDirtyRect(&data->dirty, dstrect);
    }

    if (data->renderer->
        LockTexture(data->renderer, data->texture[data->current_texture],
                    dstrect, 1, &data->surface.pixels,
                    &data->surface.pitch) < 0) {
        return -1;
    }

    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        status =
            SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
                                srcrect, data->format, dstrect->w, dstrect->h,
                                data->surface.pixels, data->surface.pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
        SDL_Rect real_srcrect = *srcrect;
        SDL_Rect real_dstrect;

        data->surface.w = dstrect->w;
        data->surface.h = dstrect->h;
        data->surface.clip_rect.w = dstrect->w;
        data->surface.clip_rect.h = dstrect->h;
        real_dstrect = data->surface.clip_rect;

        if (blendMode &
            (SDL_TextureBlendMode_Mask | SDL_TextureBlendMode_Blend)) {
            SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
        } else {
            SDL_SetAlpha(surface, 0, 0);
        }
        if (scaleMode != SDL_TextureScaleMode_None &&
            (srcrect->w != dstrect->w || srcrect->h != dstrect->h)) {
            status =
                SDL_SoftStretch(surface, &real_srcrect, &data->surface,
                                &real_dstrect);
        } else {
            status =
                SDL_LowerBlit(surface, &real_srcrect, &data->surface,
                              &real_dstrect);
        }
    }
    data->renderer->UnlockTexture(data->renderer,
                                  data->texture[data->current_texture]);
    return status;
}

static void
SW_RenderPresent(SDL_Renderer * renderer)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Texture *texture = data->texture[data->current_texture];

    /* Send the data to the display */
    if (data->renderer->info.flags & SDL_Renderer_PresentCopy) {
        SDL_DirtyRect *dirty;
        for (dirty = data->dirty.list; dirty; dirty = dirty->next) {
            data->renderer->RenderCopy(data->renderer, texture, &dirty->rect,
                                       &dirty->rect,
                                       SDL_TextureBlendMode_None,
                                       SDL_TextureScaleMode_None);
        }
        SDL_ClearDirtyRects(&data->dirty);
    } else {
        SDL_Rect rect;
        rect.x = 0;
        rect.y = 0;
        rect.w = texture->w;
        rect.h = texture->h;
        data->renderer->RenderCopy(data->renderer, texture, &rect, &rect,
                                   SDL_TextureBlendMode_None,
                                   SDL_TextureScaleMode_None);
    }
    data->renderer->RenderPresent(data->renderer);

    /* Update the flipping chain, if any */
    if (renderer->info.flags & SDL_Renderer_PresentFlip2) {
        data->current_texture = (data->current_texture + 1) % 2;
    } else if (renderer->info.flags & SDL_Renderer_PresentFlip3) {
        data->current_texture = (data->current_texture + 1) % 3;
    }
}

static void
SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SW_DestroyYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        SDL_FreeSurface(surface);
    }
}

static void
SW_DestroyRenderer(SDL_Renderer * renderer)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Window *window = SDL_GetWindowFromID(renderer->window);
    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
    int i;

    if (data) {
        for (i = 0; i < SDL_arraysize(data->texture); ++i) {
            if (data->texture[i]) {
                DestroyTexture(data->renderer, data->texture[i]);
            }
        }
        if (data->surface.format) {
            SDL_SetSurfacePalette(&data->surface, NULL);
            SDL_FreeFormat(data->surface.format);
        }
        if (display->palette) {
            SDL_DelPaletteWatch(display->palette, DisplayPaletteChanged,
                                data);
        }
        if (data->renderer) {
            data->renderer->DestroyRenderer(data->renderer);
        }
        SDL_FreeDirtyRects(&data->dirty);
        SDL_free(data);
    }
    SDL_free(renderer);
}

/* vi: set ts=4 sw=4 expandtab: */